Demonstrators against US President Barack Obama's national tax, stage a protest in Staten Island, New York, April 15, 2009. Critics of Obama marked national tax day with nationwide "tea party" protests that Republicans are calling the birth of a grassroots opposition, but Democrats dismiss as a fraud. The demonstrations, styled on the famous 1773 Boston Tea Party revolt against British colonial taxes, came as Americans rushed to meet the annual deadline for filing income tax returns.